Miscellaneous active electrical nonlinear devices – circuits – and – Signal converting – shaping – or generating – Having specific delay in producing output waveform
Patent
1996-10-11
1998-03-31
Tran, Toan
Miscellaneous active electrical nonlinear devices, circuits, and
Signal converting, shaping, or generating
Having specific delay in producing output waveform
327276, H03H 1126
Patent
active
057342849
ABSTRACT:
An RC circuit with voltage controlled delay is provided. The circuit comprises a matched pair of RC delay elements, driven by outputs of a pair of amplifiers comprising a fixed gain amplifier and a variable gain amplifier having gain m so that the delay is dependent on a gain control voltage. Preferably, the circuit is operable in a regime wherein the gain m is linearly dependent on an input control voltage so that the circuit delay is also linearly dependent on the input control voltage. Advantageously, where the amplifier gain has non-linear dependence on a gain control voltage, a control voltage generator comprising a linear to logarithmic converter is used to provide an effective linear operation in response to an input control voltage. The circuit is preferably operated in differential mode, with RC circuit elements implemented simply as resistors and capacitors, and the amplifier and active elements provided by bipolar transistors. Alternatively, MOS devices may be used for R, C elements and active devices. Although differential operation is preferred, single ended operation is an option if one of the pair of input signals is a reference voltage.
REFERENCES:
patent: 4797586 (1989-01-01), Traa
patent: 4801827 (1989-01-01), Metz
patent: 4943745 (1990-07-01), Watanabe et al.
patent: 5594390 (1997-01-01), Holzer
patent: 5652543 (1997-07-01), Fenk et al.
de Wilton Angela C.
Northern Telecom Limited
Tran Toan
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